we could recommend to use this alternative for part number CQB75-300S12N with DK# 2034-CQB75-300S12N-ND as Isolated DC/DC-Converter Module with one output 12V/6.25 A and input range from 180V to 450V:
QHL75300S12 as isolated Module DC/DC-Converter with 1 output 12V/6.25 A 180V - 450V BASEPLATE COOLED from XP Power.
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